Well yes I am older thsn you having programmed on ARPNET and PLATO. And yes I have had a broken neck with nerve damage in my left hand. So no I'm not going to hold a $600 phone other than in a firm grip with it's center of gravity in the center of the grip...
Fortunately every other phone I've ever owned had absolutely no problem with that, that is until last Thursday.
So old people or any one who can't hold their phone like a princess just shouldn't get an iPhone anymore?
For use of any expensive electronic device with nerve damaged hands, I suggest a large, non-slip, very well padded, case.
One of the reasons I purchased a bumper is that I can be clumsy with glass objects.